C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 5/10 (2006.01) C08F 220/04 (2006.01) D21C 3/22 (2006.01) D21C 9/00 (2006.01) D21C 11/10 (2006.01) D21H 21/38 (2006.01)
Patent
CA 2340057
Improved process for inhibiting calcium carbonate scaling in aqueous systems such as that employed in the Kraft pulping process. Such an improved process is achieved by the addition of at least one antiscalant comprising one monomer unit derived from the group consisting of 1,2-dihydroxy-3-butene, N- (hydroxymethyl)acrylamide and N-(sulfoxymethyl)acrylamide, and at least one monomer unit derived from the group consisting of maleic acid, acrylic acid, acrylamide, methacrylic acid, itaconic acid, vinyl sulfonic acid, styrene sulfonic acid, N-tertbutylacrylamide, butoxymethylacrylamide, N,N- dimethylacrylamide, sodium acrylamidomethyl propane sulfonic acid, and salts thereof.
La présente invention concerne un procédé d'inhibition d'incrustation de carbonate de calcium dans des systèmes aqueux tels que ceux utilisés dans le procédé kraft de production de pâte à papier. Une tel procédé comporte l'addition au système d'au moins un agent anti-incrustation contenant une unité monomère choisie dans le groupe qui comprend du 1,2-dihydroxy-3-butène, du N-(hydroxyméthyle)acrylamide, et du N-(sulfométhyle)acrylamide, et au moins une unité monomère choisie dans le groupe qui comprend l'acide maléique, l'acide acrylique, l'acrylamide, l'acide méthacrylique, l'acide itaconique, l'acide vinylsulfonique, l'acide styrène sulfonique, le N-tertbutylacrylamide, le butoxyméthylacrylamide, le N,N-dimethylacrylamide, l'acide sodium acrylamidométhylpropane sulfonique, ainsi que leurs sels.
Duggirala Prasad Yogendra
Morris John David
Reed Peter Edward
Severtson Steven John
Bcf Llp
Nalco Chemical Company
Ondeo Nalco Company
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